SupaMax

Hey guys I have a 3rd gen and Im tryin to get a piece of wood to fit across the backseats since they dont fold down. Im tryin to install my Amp and Capacitator to the wood and hide all the wires behind the wood. The panel that goes on my backseat is definately not strong enough to hold both items they jus fall down when I hit a corner. So I need some help on dimensions for the piece of wood. I need it to fit the back panel of the doors in the trunk. Much help would be appreciated.
help me out guys...........